How many rounds before accuracy drop off?

How many rounds do you get before fouling starts accuracy drop off? My barrel is still fairly new, about 175 rounds through it. It's a stock savage 6.5-284 Norma. I'd like to know how many shots one should be able to shoot before the barrel fouls to the point that accuracy falls off. Mine seems to open up around 35-45. Is that normal??

Each rifle is different. There are too many variables involved to come up with any point that accuracy will drop off. If accuracy drops off between 35 and 45 rounds in your rifle then that is your answer for your rifle. If you change powder or bullet then things could be different.

Every barrel is different but 35 is probably about right. I've had barrels on my short range be guns that only had a window of about 25 rounds that they would shoot well. And you had to have at least 3 fouler rounds down it

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I dont know who ever came up with the imaganary word of "Over Gunned"